Pro-Football-Reference's set of Play Index tools includes a Player Game Finder that is able to do many kinds of searches for single-game performances. One of the filters you're able to use in the Player Game Finder is position, which is available at the single-game level back to 1999. Previously you were only able to search for one position at a time, but now we've instituted the same checkbox system used by the Player Season Finder so that you can search across multiple positions at a time.